Duck Shoes are lace up, waterproof shoes with a flat, wide rubber vamp. They have gum rubber traction soles, low cut leather uppers, and are usually lined with an insulated material. Duck Shoes are designed for wear in rain, snow, slush and just about any cold or wet weather.
About Shearling:
Sheep or lambskin with attached wool. Generally used as a lining in footwear to provide warmth.